2 Answers
2

You can't do this client sided, or at least, legally. A client side modification would be a hack and in the event of attempting to do this you will likely get VAC'd.

You need a server side plugin to do this for you. Whether you create a local game on your computer or connect to one online, you are still playing in a server environment. When you start a game on your computer it creates a server with your local IP and connects you to it.

The easiest way for you do do this for yourself playing with bots would be to install Sourcemod in your cstrike folder. It's in steam>steamapps>yourname>counter strike source>cstrike

There you will create a addons folder, inwhich you will put sourcemod, metamod, metamod.vdf, etc.

+1 OP doesn't seem to understand that there are no single-player matches in CS:S - even when you are playing by yourself against bots, you are still creating a multiplayer-server and connecting to it (possibly both on the same computer). Thus, what he's looking for is exactly this: a server-side plugin to increase damage.
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BlueRaja - Danny PflughoeftNov 1 '11 at 21:41

well in most headshot only server they adjusted this in the server config so bullets deal more damage so if he can find 1 of those he prob has his answer
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ronnieNov 1 '11 at 13:05

@ronnie: There is no such config. Headshot-only servers use a serverside-plugin, like the one linked by stevether above. Also, perhaps you should edit your answer - for CS, "script" usually refers to something client-side (because there are no legal client-side "plugins"), so "headshot-only script" sounds like you are recommending downloading hacks.
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BlueRaja - Danny PflughoeftNov 1 '11 at 21:36

a script in my eyes normally refers to a buy script or such wich are fully legal however people of lower skills don't know this most of the time however plugins are also scripts... however you use these on your server so if he sets up his own server (which i think he means since else it would ofc be a hack however u can't change that in your own config) and why update my answer for CS? when it's about CSS...
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ronnieNov 2 '11 at 7:40